“在”和“于”都是介词,都可以出现在动词后,而且出现在动词后差别不大,有时甚至可以互换,但二者在语用方面仍有些细微的差别。本文拟探究“V在”和“V于”在语体、语篇、韵律等语用方面的差异,然后给予认知的解释。 Both “” and “at ” are prepositions that can both appear after the verb, but after the verb, they are not very different and sometimes even interchangeable. However, there are still some subtle differences in their pragmatics. This article intends to explore the differences between pragmatic, discourse, rhythm and other pragmatic aspects of “V” and “V in”, and then give a cognitive explanation.